Personally I prefer the 10mm over the .40, but the .45 is my favorite.
For Christmas I bought my wife a Beretta PX4 Storm Compact, not mini compact in 9mm. She received her CCW in November.
I see the XD's in .45 at every show I go to and they're all priced between $450-$600 depending if they were new or used. I'm kinda old school, but I still carry my dad's Browning Hi-Power.